643198420446 has 8 divisors (see below), whose sum is σ = 1286396840904. Its totient is φ = 214399473480.

The previous prime is 643198420429. The next prime is 643198420457. The reversal of 643198420446 is 644024891346.

643198420446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

643198420446 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53599868365 + ... + 53599868376.

It is an arithmetic number, because the mean of its divisors is an integer number (160799605113).

Almost surely, 2^643198420446 is an apocalyptic number.

643198420446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643198420446 is a wasteful number, since it uses less digits than its factorization.

643198420446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107199736746.

The product of its (nonzero) digits is 3981312, while the sum is 51.

The spelling of 643198420446 in words is "six hundred forty-three billion, one hundred ninety-eight million, four hundred twenty thousand, four hundred forty-six".